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Spinning tubes: An authentic research experience in a three-hour laboratory
2.J. W. Zwart and S. D. Steenwyk, “Spinning tubes: An exercise in laboratory problem solving,” Proceedings of the 1996 North Midwest Section Meeting, American Society for Engineering Education, Fargo, ND, 3–5 October 1996, pp. II.C-4.1–II.C-4.4.
6.In most cases (using different types of PVC or CPVC), a very fine-grade steel wool works well. In other cases, methanol or acetone gives better results in dissolving the ink.
7.Although integer length/diameter ratios are not necessary to render the symbols alternately visible and invisible, they do allow the pattern to be approximately stationary in orientation and thus help elicit both curiosity and insight.
8.If several markings are made adjacent to one another from the end toward the center of the tube, it is interesting to note that at least two are typically viewed as stationary, showing that there is a range of velocities near zero that will make it work. Being near zero here means that a visible symbol’s speed is below some “blurring limit” of the eye.
9.Lorne A. Whitehead and Frank L. Curzon, “Spinning objects on horizontal planes,” Am. J. Phys. 51 (5), 449–452 (1983);
9.reprinted with corrections and notes as Chap. 8 of Jearl Walker, Roundabout: The Physics of Rotation in the Everyday World (Freeman, New York, 1985), pp. 45–49. These articles do not discuss the appearance of the symbol at one end, which is the feature we focus on here.
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